[PATCH] D14469: [ARM] add overrides for isCheapToSpeculateCttz() and isCheapToSpeculateCtlz()

[Sanjay Patel via llvm-commits]

This revision was automatically updated to reflect the committed changes.
Closed by commit rL252639: [ARM] add overrides for isCheapToSpeculateCttz() and isCheapToSpeculateCtlz() (authored by spatel).

Changed prior to commit:
  http://reviews.llvm.org/D14469?vs=39608&id=39839#toc

Repository:
  rL LLVM

http://reviews.llvm.org/D14469

Files:
  llvm/trunk/lib/Target/ARM/ARMISelLowering.cpp
  llvm/trunk/lib/Target/ARM/ARMISelLowering.h
  llvm/trunk/test/Transforms/SimplifyCFG/ARM/cttz-ctlz.ll
  llvm/trunk/test/Transforms/SimplifyCFG/ARM/lit.local.cfg

Index: llvm/trunk/test/Transforms/SimplifyCFG/ARM/cttz-ctlz.ll
===================================================================
--- llvm/trunk/test/Transforms/SimplifyCFG/ARM/cttz-ctlz.ll
+++ llvm/trunk/test/Transforms/SimplifyCFG/ARM/cttz-ctlz.ll
@@ -0,0 +1,43 @@
+; RUN: opt -S -simplifycfg -mtriple=arm -mattr=+v6t2 < %s | FileCheck %s
+
+define i32 @ctlz(i32 %A) {
+; CHECK-LABEL: @ctlz(
+; CHECK: [[ICMP:%[A-Za-z0-9]+]] = icmp eq i32 %A, 0
+; CHECK-NEXT: [[CTZ:%[A-Za-z0-9]+]] = tail call i32 @llvm.ctlz.i32(i32 %A, i1 true)
+; CHECK-NEXT: [[SEL:%[A-Za-z0-9.]+]] = select i1 [[ICMP]], i32 32, i32 [[CTZ]]
+; CHECK-NEXT: ret i32 [[SEL]]
+entry:
+  %tobool = icmp eq i32 %A, 0
+  br i1 %tobool, label %cond.end, label %cond.true
+
+cond.true:
+  %0 = tail call i32 @llvm.ctlz.i32(i32 %A, i1 true)
+  br label %cond.end
+
+cond.end:
+  %cond = phi i32 [ %0, %cond.true ], [ 32, %entry ]
+  ret i32 %cond
+}
+
+define i32 @cttz(i32 %A) {
+; CHECK-LABEL: @cttz(
+; CHECK: [[ICMP:%[A-Za-z0-9]+]] = icmp eq i32 %A, 0
+; CHECK-NEXT: [[CTZ:%[A-Za-z0-9]+]] = tail call i32 @llvm.cttz.i32(i32 %A, i1 true)
+; CHECK-NEXT: [[SEL:%[A-Za-z0-9.]+]] = select i1 [[ICMP]], i32 32, i32 [[CTZ]]
+; CHECK-NEXT: ret i32 [[SEL]]
+entry:
+  %tobool = icmp eq i32 %A, 0
+  br i1 %tobool, label %cond.end, label %cond.true
+
+cond.true:
+  %0 = tail call i32 @llvm.cttz.i32(i32 %A, i1 true)
+  br label %cond.end
+
+cond.end:
+  %cond = phi i32 [ %0, %cond.true ], [ 32, %entry ]
+  ret i32 %cond
+}
+
+declare i32 @llvm.ctlz.i32(i32, i1)
+declare i32 @llvm.cttz.i32(i32, i1)
+
Index: llvm/trunk/test/Transforms/SimplifyCFG/ARM/lit.local.cfg
===================================================================
--- llvm/trunk/test/Transforms/SimplifyCFG/ARM/lit.local.cfg
+++ llvm/trunk/test/Transforms/SimplifyCFG/ARM/lit.local.cfg
@@ -0,0 +1,5 @@
+config.suffixes = ['.ll']
+
+targets = set(config.root.targets_to_build.split())
+if not 'ARM' in targets:
+    config.unsupported = True
Index: llvm/trunk/lib/Target/ARM/ARMISelLowering.h
===================================================================
--- llvm/trunk/lib/Target/ARM/ARMISelLowering.h
+++ llvm/trunk/lib/Target/ARM/ARMISelLowering.h
@@ -467,6 +467,9 @@
     bool canCombineStoreAndExtract(Type *VectorTy, Value *Idx,
                                    unsigned &Cost) const override;
 
+    bool isCheapToSpeculateCttz() const override;
+    bool isCheapToSpeculateCtlz() const override;
+
   protected:
     std::pair<const TargetRegisterClass *, uint8_t>
     findRepresentativeClass(const TargetRegisterInfo *TRI,
Index: llvm/trunk/lib/Target/ARM/ARMISelLowering.cpp
===================================================================
--- llvm/trunk/lib/Target/ARM/ARMISelLowering.cpp
+++ llvm/trunk/lib/Target/ARM/ARMISelLowering.cpp
@@ -11841,6 +11841,14 @@
   return false;
 }
 
+bool ARMTargetLowering::isCheapToSpeculateCttz() const {
+  return Subtarget->hasV6T2Ops();
+}
+
+bool ARMTargetLowering::isCheapToSpeculateCtlz() const {
+  return Subtarget->hasV6T2Ops();
+}
+
 Value *ARMTargetLowering::emitLoadLinked(IRBuilder<> &Builder, Value *Addr,
                                          AtomicOrdering Ord) const {
   Module *M = Builder.GetInsertBlock()->getParent()->getParent();


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